The problem is that you have to create a power structure to enforce the rules. The entire premise hinges on the entire world cooperating, which is a pipe dream.

There's a reason things like communism never work on a very large scale, and that's partly because the more complex a system is, the easier it is for bad actors to infiltrate. The problem with looking at pre colonial times is that those were, relatively speaking, extremely small collectives.

Representative democracies should perform the way I've heard people try to explain anarchy, but they don't because people suck.